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在springboot中对kafka进行读写的示例代码

作者：冬天里的懒喵　　发布时间：2023-11-26 00:48:02　

标签：springboot,kafka

springboot对kafka的client很好的实现了集成，使用非常方便，本文也实现了一个在springboot中实现操作kafka的demo。

1.POM配置

只需要在dependencies中增加 spring-kafka的配置即可。完整效果如下：

<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.5.4.RELEASE</version>
</parent>

<properties>
<java.version>1.8</java.version>
<spring-kafka.version>1.2.2.RELEASE</spring-kafka.version>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>

<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-aop</artifactId>
</dependency>

<dependency>
<groupId>org.springframework.kafka</groupId>
<artifactId>spring-kafka</artifactId>
<version>${spring-kafka.version}</version>
</dependency>
<dependency>
<groupId>org.springframework.kafka</groupId>
<artifactId>spring-kafka-test</artifactId>
<version>${spring-kafka.version}</version>
<scope>test</scope>
</dependency>
</dependencies>

2.生产者

参数配置类，其参数卸载yml文件中，通过@Value注入

package com.dhb.kafka.producer;

import org.apache.kafka.clients.producer.ProducerConfig;
import org.apache.kafka.common.serialization.StringSerializer;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.kafka.core.DefaultKafkaProducerFactory;
import org.springframework.kafka.core.KafkaTemplate;
import org.springframework.kafka.core.ProducerFactory;

import java.util.HashMap;
import java.util.Map;

@Configuration
public class SenderConfig {

@Value("${kafka.bootstrap-servers}")
private String bootstrapServers;

@Bean
public Map<String,Object> producerConfigs() {
Map<String,Object> props = new HashMap<>();
props.put(ProducerConfig.BOOTSTRAP_SERVERS_CONFIG,this.bootstrapServers);
props.put(ProducerConfig.KEY_SERIALIZER_CLASS_CONFIG, StringSerializer.class);
props.put(ProducerConfig.VALUE_SERIALIZER_CLASS_CONFIG,StringSerializer.class);
props.put(ProducerConfig.ACKS_CONFIG,"0");
return props;
}

@Bean
public ProducerFactory<String,String> producerFactory() {
return new DefaultKafkaProducerFactory<>(producerConfigs());
}

@Bean
public KafkaTemplate<String,String> kafkaTemplate() {
return new KafkaTemplate<String, String>(producerFactory());
}

@Bean
public Sender sender() {
return new Sender();
}
}

消息发送类

package com.dhb.kafka.producer;

import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.kafka.core.KafkaTemplate;

@Slf4j
public class Sender {

@Autowired
private KafkaTemplate<String,String> kafkaTemplate;

public void send(String topic,String payload) {
log.info("sending payload='{}' to topic='{}'",payload,topic);
this.kafkaTemplate.send(topic,payload);
}
}

3.消费者

参数配置类

package com.dhb.kafka.consumer;

import org.apache.kafka.clients.consumer.ConsumerConfig;
import org.apache.kafka.common.serialization.StringDeserializer;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.kafka.annotation.EnableKafka;
import org.springframework.kafka.config.ConcurrentKafkaListenerContainerFactory;
import org.springframework.kafka.core.ConsumerFactory;
import org.springframework.kafka.core.DefaultKafkaConsumerFactory;

import java.util.HashMap;
import java.util.Map;

@Configuration
@EnableKafka
public class ReceiverConfig {

@Value("${kafka.bootstrap-servers}")
private String bootstrapServers;

public Map<String,Object> consumerConfigs() {
Map<String,Object> props = new HashMap<>();
props.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG,bootstrapServers);
props.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class);
props.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG,StringDeserializer.class);
props.put(ConsumerConfig.GROUP_ID_CONFIG,"helloword");
return props;
}

@Bean
public ConsumerFactory<String,String> consumerFactory() {
return new DefaultKafkaConsumerFactory<>(consumerConfigs());
}

@Bean
public ConcurrentKafkaListenerContainerFactory<String,String> kafkaListenerContainerFactory() {
ConcurrentKafkaListenerContainerFactory<String,String> factory =
new ConcurrentKafkaListenerContainerFactory<>();
factory.setConsumerFactory(consumerFactory());
return factory;
}

@Bean
public Receiver receiver() {
return new Receiver();
}

}

消息接受类

package com.dhb.kafka.consumer;

import lombok.extern.slf4j.Slf4j;
import org.springframework.kafka.annotation.KafkaListener;

import java.util.concurrent.CountDownLatch;

@Slf4j
public class Receiver {

private CountDownLatch latch = new CountDownLatch(1);

public CountDownLatch getLatch() {
return latch;
}

@KafkaListener(topics = "${kafka.topic.helloworld}")
public void receive(String payload) {
log.info("received payload='{}'",payload);
latch.countDown();
}
}

3.web测试类

定义了一个基于http的web测试接口

package com.dhb.kafka.web;

import com.dhb.kafka.producer.Sender;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@RestController
@Slf4j
public class KafkaProducer {

@Autowired
Sender sender;

@RequestMapping(value = "/sender.action", method = RequestMethod.POST)
public void exec(HttpServletRequest request, HttpServletResponse response,String data) throws IOException{
this.sender.send("testtopic",data);
response.setCharacterEncoding("UTF-8");
response.setContentType("text/json");
response.getWriter().write("success");
response.getWriter().flush();
response.getWriter().close();
}

}

4.启动类及配置

package com.dhb.kafka;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class KafkaApplication {

public static void main(String[] args) {
SpringApplication.run(KafkaApplication.class,args);

}
}

application.yml